Cleanup: various non-functional changes for C++

source/blender/animrig/intern/keyframing.cc

@@ -891,14 +891,14 @@ static CombinedKeyingResult insert_key_layered_action(
     Main *bmain,
     Action &action,
     Layer &layer,
-    Slot &slot,
+    const Slot &slot,
     PropertyRNA *prop,
     const std::optional<StringRefNull> channel_group,
     const std::string &rna_path,
     const float frame,
     const Span<float> values,
     const eInsertKeyFlags insert_key_flags,
-    const KeyframeSettings key_settings,
+    const KeyframeSettings &key_settings,
     const BitSpan keying_mask)
 {
   BLI_assert(bmain != nullptr);

source/blender/editors/space_file/file_ops.cc

@@ -2874,7 +2874,7 @@ void file_directory_enter_handle(bContext *C, void * /*arg_unused*/, void * /*ar
     return;
   }
 
-  Main *bmain = CTX_data_main(C);
+  const Main *bmain = CTX_data_main(C);
   char old_dir[sizeof(params->dir)];
 
   STRNCPY(old_dir, params->dir);
@@ -2961,7 +2961,7 @@ void file_filename_enter_handle(bContext *C, void * /*arg_unused*/, void *arg_bu
     return;
   }
 
-  Main *bmain = CTX_data_main(C);
+  const Main *bmain = CTX_data_main(C);
   uiBut *but = static_cast<uiBut *>(arg_but);
 
   file_expand_directory(bmain, params);

source/blender/editors/util/numinput.cc

@@ -286,7 +286,7 @@ bool user_string_to_number(bContext *C,
     return BPY_run_string_as_number(C, nullptr, str_unit_convert, &err_info, r_value);
   }
 
-  int success = BPY_run_string_as_number(C, nullptr, str, &err_info, r_value);
+  bool success = BPY_run_string_as_number(C, nullptr, str, &err_info, r_value);
   *r_value = BKE_unit_apply_preferred_unit(unit, type, *r_value);
   *r_value /= unit_scale;
   return success;

source/blender/io/collada/AnimationImporter.cpp

@@ -593,7 +593,7 @@ float AnimationImporter::convert_to_focal_length(float in_xfov,
 void AnimationImporter::Assign_lens_animations(const COLLADAFW::UniqueId &listid,
                                                AnimData &adt,
                                                const double aspect,
-                                               Camera *cam,
+                                               const Camera *cam,
                                                const char *anim_type,
                                                int fov_type)
 {
@@ -841,7 +841,6 @@ void AnimationImporter::translate_Animations(
   }
 
   AnimationImporter::AnimMix *animType = get_animation_type(node, FW_object_map);
-  bAction *act;
   Main *bmain = CTX_data_main(mContext);
 
   if ((animType->transform) != 0) {

source/blender/io/collada/AnimationImporter.h

@@ -185,7 +185,7 @@ class AnimationImporter : private TransformReader, public AnimationImporterBase
   void Assign_lens_animations(const COLLADAFW::UniqueId &listid,
                               AnimData &adt,
                               double aspect,
-                              Camera *cam,
+                              const Camera *cam,
                               const char *anim_type,
                               int fov_type);